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opendht/src/dht_proxy_server.cpp
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/*
* Copyright (C) 2014-2020 Savoir-faire Linux Inc.
* Author: Sébastien Blin <sebastien.blin@savoirfairelinux.com>
* Adrien Béraud <adrien.beraud@savoirfairelinux.com>
* Vsevolod Ivanov <vsevolod.ivanov@savoirfairelinux.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "dht_proxy_server.h"
#include "default_types.h"
#include "dhtrunner.h"
#include <msgpack.hpp>
#include <json/json.h>
#include <chrono>
#include <functional>
#include <limits>
#include <iostream>
using namespace std::placeholders;
using namespace std::chrono_literals;
#ifdef OPENDHT_PROXY_HTTP_PARSER_FORK
namespace restinio {
struct custom_http_methods_t
{
static constexpr restinio::http_method_id_t from_nodejs(int m) noexcept {
if(m == method_listen.raw_id())
return method_listen;
else if(m == method_stats.raw_id())
return method_stats;
else if(m == method_sign.raw_id())
return method_sign;
else if(m == method_encrypt.raw_id())
return method_encrypt;
else
return restinio::default_http_methods_t::from_nodejs(m);
}
};
}
#endif
namespace dht {
constexpr char RESP_MSG_JSON_INCORRECT[] = "{\"err:\":\"Incorrect JSON\"}";
constexpr char RESP_MSG_SERVICE_UNAVAILABLE[] = "{\"err\":\"Incorrect DhtRunner\"}";
constexpr char RESP_MSG_INTERNAL_SERVER_ERRROR[] = "{\"err\":\"Internal server error\"}";
constexpr char RESP_MSG_MISSING_PARAMS[] = "{\"err\":\"Missing parameters\"}";
constexpr char RESP_MSG_PUT_FAILED[] = "{\"err\":\"Put failed\"}";
#ifdef OPENDHT_PROXY_SERVER_IDENTITY
constexpr char RESP_MSG_DESTINATION_NOT_FOUND[] = "{\"err\":\"No destination found\"}";
#endif
#ifdef OPENDHT_PUSH_NOTIFICATIONS
constexpr char RESP_MSG_NO_TOKEN[] = "{\"err\":\"No token\"}";
#endif
constexpr const std::chrono::minutes PRINT_STATS_PERIOD {2};
using ResponseByParts = restinio::chunked_output_t;
using ResponseByPartsBuilder = restinio::response_builder_t<ResponseByParts>;
class opendht_logger_t
{
public:
opendht_logger_t(std::shared_ptr<Logger> logger = {}) : m_logger(std::move(logger)) {}
template <typename Builder>
void trace(Builder&& /* msg_builder */) {
/* if (m_logger) m_logger->d("[proxy:server] %s", msg_builder().c_str()); */
}
template <typename Builder>
void info(Builder&& msg_builder) {
if (m_logger) m_logger->d("[proxy:server] %s", msg_builder().c_str());
}
template <typename Builder>
void warn(Builder&& msg_builder) {
if (m_logger) m_logger->w("[proxy:server] %s", msg_builder().c_str());
}
template <typename Builder>
void error(Builder&& msg_builder) {
if (m_logger) m_logger->e("[proxy:server] %s", msg_builder().c_str());
}
private:
std::shared_ptr<Logger> m_logger;
};
restinio::request_handling_status_t
DhtProxyServer::serverError(restinio::request_t& request) {
auto response = initHttpResponse(request.create_response(restinio::status_internal_server_error()));
response.set_body(RESP_MSG_INTERNAL_SERVER_ERRROR);
return response.done();
}
// connection listener
class DhtProxyServer::ConnectionListener
{
public:
ConnectionListener() {};
ConnectionListener(std::function<void(restinio::connection_id_t)> onClosed) : onClosed_(std::move(onClosed)) {};
~ConnectionListener() {};
/**
* Connection state change used to handle Listeners disconnects.
* RESTinio >= 0.5.1 https://github.com/Stiffstream/restinio/issues/28
*/
void state_changed(const restinio::connection_state::notice_t& notice) noexcept;
private:
std::function<void(restinio::connection_id_t)> onClosed_;
};
void
DhtProxyServer::ConnectionListener::state_changed(const restinio::connection_state::notice_t& notice) noexcept
{
if (restinio::holds_alternative<restinio::connection_state::closed_t>(notice.cause())) {
onClosed_(notice.connection_id());
}
}
void
DhtProxyServer::onConnectionClosed(restinio::connection_id_t id)
{
std::lock_guard<std::mutex> lock(lockListener_);
auto it = listeners_.find(id);
if (it != listeners_.end()) {
dht_->cancelListen(it->second.hash, std::move(it->second.token));
listeners_.erase(it);
if (logger_)
logger_->d("[proxy:server] [connection:%li] listener cancelled, %li still connected", id, listeners_.size());
}
}
struct DhtProxyServer::RestRouterTraitsTls : public restinio::default_tls_traits_t
{
using timer_manager_t = restinio::asio_timer_manager_t;
#ifdef OPENDHT_PROXY_HTTP_PARSER_FORK
using http_methods_mapper_t = restinio::custom_http_methods_t;
#endif
using logger_t = opendht_logger_t;
using request_handler_t = RestRouter;
using connection_state_listener_t = ConnectionListener;
};
struct DhtProxyServer::RestRouterTraits : public restinio::default_traits_t
{
using timer_manager_t = restinio::asio_timer_manager_t;
#ifdef OPENDHT_PROXY_HTTP_PARSER_FORK
using http_methods_mapper_t = restinio::custom_http_methods_t;
#endif
using logger_t = opendht_logger_t;
using request_handler_t = RestRouter;
using connection_state_listener_t = ConnectionListener;
};
DhtProxyServer::DhtProxyServer(
crypto::Identity identity,
std::shared_ptr<DhtRunner> dht, in_port_t port, const std::string& pushServer,
std::shared_ptr<Logger> logger
)
: ioContext_(std::make_shared<asio::io_context>()),
dht_(dht), logger_(logger),
printStatsTimer_(std::make_unique<asio::steady_timer>(*ioContext_, 3s)),
connListener_(std::make_shared<ConnectionListener>(std::bind(&DhtProxyServer::onConnectionClosed, this, std::placeholders::_1))),
pushServer_(pushServer)
{
if (not dht_)
throw std::invalid_argument("A DHT instance must be provided");
if (logger_)
logger_->d("[proxy:server] [init] running on %i", port);
if (not pushServer.empty()){
#ifdef OPENDHT_PUSH_NOTIFICATIONS
if (logger_)
logger_->d("[proxy:server] [init] using push server %s", pushServer.c_str());
#else
if (logger_)
logger_->e("[proxy:server] [init] opendht built without push notification support");
#endif
}
jsonBuilder_["commentStyle"] = "None";
jsonBuilder_["indentation"] = "";
if (!pushServer.empty()){
// no host delim, assume port only
if (pushServer.find(":") == std::string::npos)
pushServer_ = "localhost:" + pushServer_;
// define http request destination for push notifications
pushHostPort_ = splitPort(pushServer_);
if (logger_)
logger_->d("Using push server for notifications: %s:%s", pushHostPort_.first.c_str(),
pushHostPort_.second.c_str());
}
if (identity.first and identity.second) {
asio::error_code ec;
// define tls context
asio::ssl::context tls_context { asio::ssl::context::sslv23 };
tls_context.set_options(asio::ssl::context::default_workarounds
| asio::ssl::context::no_sslv2
| asio::ssl::context::single_dh_use, ec);
if (ec)
throw std::runtime_error("Error setting tls context options: " + ec.message());
// add more security options
#ifdef SSL_OP_NO_RENEGOTIATION
SSL_CTX_set_options(tls_context.native_handle(), SSL_OP_NO_RENEGOTIATION); // CVE-2009-3555
#endif
// node private key
auto key = identity.first->serialize();
tls_context.use_private_key(asio::const_buffer{key.data(), key.size()},
asio::ssl::context::file_format::pem, ec);
if (ec)
throw std::runtime_error("Error setting node's private key: " + ec.message());
// certificate chain
auto certchain = identity.second->toString(true/*chain*/);
tls_context.use_certificate_chain(asio::const_buffer{certchain.data(), certchain.size()}, ec);
if (ec)
throw std::runtime_error("Error setting certificate chain: " + ec.message());
if (logger_)
logger_->d("[proxy:server] using certificate chain for ssl:\n%s", certchain.c_str());
// build http server
auto settings = restinio::run_on_this_thread_settings_t<RestRouterTraitsTls>();
addServerSettings(settings);
settings.port(port);
settings.tls_context(std::move(tls_context));
httpsServer_ = std::make_unique<restinio::http_server_t<RestRouterTraitsTls>>(
ioContext_,
std::forward<restinio::run_on_this_thread_settings_t<RestRouterTraitsTls>>(std::move(settings))
);
// run http server
serverThread_ = std::thread([this]{
httpsServer_->open_async([]{/*ok*/}, [](std::exception_ptr ex){
std::rethrow_exception(ex);
});
httpsServer_->io_context().run();
});
}
else {
auto settings = restinio::run_on_this_thread_settings_t<RestRouterTraits>();
addServerSettings(settings);
settings.port(port);
httpServer_ = std::make_unique<restinio::http_server_t<RestRouterTraits>>(
ioContext_,
std::forward<restinio::run_on_this_thread_settings_t<RestRouterTraits>>(std::move(settings))
);
// run http server
serverThread_ = std::thread([this](){
httpServer_->open_async([]{/*ok*/}, [](std::exception_ptr ex){
std::rethrow_exception(ex);
});
httpServer_->io_context().run();
});
}
dht->forwardAllMessages(true);
updateStats();
printStatsTimer_->async_wait(std::bind(&DhtProxyServer::handlePrintStats, this, std::placeholders::_1));
}
asio::io_context&
DhtProxyServer::io_context() const
{
return *ioContext_;
}
DhtProxyServer::~DhtProxyServer()
{
if (dht_) {
std::lock_guard<std::mutex> lock(lockListener_);
for (auto& l : listeners_) {
dht_->cancelListen(l.second.hash, std::move(l.second.token));
if (l.second.response)
l.second.response->done();
}
#ifdef OPENDHT_PUSH_NOTIFICATIONS
for (auto& lm: pushListeners_) {
for (auto& ls: lm.second.listeners)
for (auto& l : ls.second) {
if (l.expireNotifyTimer)
l.expireNotifyTimer->cancel();
if (l.expireTimer)
l.expireTimer->cancel();
dht_->cancelListen(ls.first, std::move(l.internalToken));
}
}
pushListeners_.clear();
#endif
}
if (logger_)
logger_->d("[proxy:server] closing http server");
ioContext_->stop();
if (serverThread_.joinable())
serverThread_.join();
if (logger_)
logger_->d("[proxy:server] http server closed");
}
template< typename ServerSettings >
void
DhtProxyServer::addServerSettings(ServerSettings& settings, const unsigned int max_pipelined_requests)
{
using namespace std::chrono;
/**
* If max_pipelined_requests is greater than 1 then RESTinio will continue
* to read from the socket after parsing the first request.
* In that case, RESTinio can detect the disconnection
* and calls state listener as expected.
* https://github.com/Stiffstream/restinio/issues/28
*/
settings.max_pipelined_requests(max_pipelined_requests);
// one less to detect the listener disconnect
settings.concurrent_accepts_count(max_pipelined_requests - 1);
settings.separate_accept_and_create_connect(true);
settings.logger(logger_);
settings.protocol(restinio::asio_ns::ip::tcp::v6());
settings.request_handler(createRestRouter());
// time limits // ~ 0.8 month
std::chrono::milliseconds timeout_request(std::numeric_limits<int>::max());
settings.read_next_http_message_timelimit(timeout_request);
settings.write_http_response_timelimit(60s);
settings.handle_request_timeout(timeout_request);
// socket options
settings.socket_options_setter([](auto & options){
options.set_option(asio::ip::tcp::no_delay{true});
});
settings.connection_state_listener(connListener_);
}
std::shared_ptr<DhtProxyServer::ServerStats>
DhtProxyServer::updateStats(std::shared_ptr<NodeInfo> info) const
{
auto now = clock::now();
auto last = lastStatsReset_.exchange(now);
auto count = requestNum_.exchange(0);
auto dt = std::chrono::duration<double>(now - last);
auto sstats = std::make_shared<ServerStats>();
auto& stats = *sstats;
stats.requestRate = count / dt.count();
#ifdef OPENDHT_PUSH_NOTIFICATIONS
stats.pushListenersCount = pushListeners_.size();
#endif
stats.putCount = puts_.size();
stats.listenCount = listeners_.size();
stats.nodeInfo = info;
return sstats;
}
void
DhtProxyServer::updateStats() {
dht_->getNodeInfo([this](std::shared_ptr<NodeInfo> newInfo){
stats_ = updateStats(newInfo);
nodeInfo_ = newInfo;
if (logger_) {
auto str = Json::writeString(jsonBuilder_, newInfo->toJson());
logger_->d("[proxy:server] [stats] %s", str.c_str());
}
});
}
void
DhtProxyServer::handlePrintStats(const asio::error_code &ec)
{
if (ec == asio::error::operation_aborted)
return;
updateStats();
printStatsTimer_->expires_at(printStatsTimer_->expiry() + PRINT_STATS_PERIOD);
printStatsTimer_->async_wait(std::bind(&DhtProxyServer::handlePrintStats, this, std::placeholders::_1));
}
template <typename HttpResponse>
HttpResponse DhtProxyServer::initHttpResponse(HttpResponse response)
{
response.append_header("Server", "RESTinio");
response.append_header(restinio::http_field::content_type, "application/json");
response.append_header(restinio::http_field::access_control_allow_origin, "*");
return response;
}
std::unique_ptr<RestRouter>
DhtProxyServer::createRestRouter()
{
using namespace std::placeholders;
auto router = std::make_unique<RestRouter>();
// **************************** LEGACY ROUTES ****************************
// node.info
router->http_get("/", std::bind(&DhtProxyServer::getNodeInfo, this, _1, _2));
#ifdef OPENDHT_PROXY_HTTP_PARSER_FORK
// node.stats
router->add_handler(restinio::custom_http_methods_t::from_nodejs(restinio::method_stats.raw_id()),
"/", std::bind(&DhtProxyServer::getStats, this, _1, _2));
#endif
// key.options
router->add_handler(restinio::http_method_options(),
"/:hash", std::bind(&DhtProxyServer::options, this, _1, _2));
// key.get
router->http_get("/:hash", std::bind(&DhtProxyServer::get, this, _1, _2));
// key.post
router->http_post("/:hash", std::bind(&DhtProxyServer::put, this, _1, _2));
#ifdef OPENDHT_PROXY_HTTP_PARSER_FORK
// key.listen
router->add_handler(restinio::custom_http_methods_t::from_nodejs(restinio::method_listen.raw_id()),
"/:hash", std::bind(&DhtProxyServer::listen, this, _1, _2));
#endif
#ifdef OPENDHT_PUSH_NOTIFICATIONS
// key.subscribe
router->add_handler(restinio::http_method_subscribe(),
"/:hash", std::bind(&DhtProxyServer::subscribe, this, _1, _2));
// key.unsubscribe
router->add_handler(restinio::http_method_unsubscribe(),
"/:hash", std::bind(&DhtProxyServer::unsubscribe, this, _1, _2));
#endif //OPENDHT_PUSH_NOTIFICATIONS
#ifdef OPENDHT_PROXY_SERVER_IDENTITY
#ifdef OPENDHT_PROXY_HTTP_PARSER_FORK
// key.sign
router->add_handler(restinio::custom_http_methods_t::from_nodejs(restinio::method_sign.raw_id()),
"/:hash", std::bind(&DhtProxyServer::putSigned, this, _1, _2));
// key.encrypt
router->add_handler(restinio::custom_http_methods_t::from_nodejs(restinio::method_encrypt.raw_id()),
"/:hash", std::bind(&DhtProxyServer::putEncrypted, this, _1, _2));
#endif
#endif // OPENDHT_PROXY_SERVER_IDENTITY
// **************************** NEW ROUTES ****************************
// node.info
router->http_get("/node/info", std::bind(&DhtProxyServer::getNodeInfo, this, _1, _2));
// node.stats
router->http_get("/node/stats", std::bind(&DhtProxyServer::getStats, this, _1, _2));
// key.options
router->http_get("/key/:hash/options", std::bind(&DhtProxyServer::options, this, _1, _2));
// key.get
router->http_get("/key/:hash", std::bind(&DhtProxyServer::get, this, _1, _2));
// key.post
router->http_post("/key/:hash", std::bind(&DhtProxyServer::put, this, _1, _2));
// key.listen
router->http_get("/key/:hash/listen", std::bind(&DhtProxyServer::listen, this, _1, _2));
#ifdef OPENDHT_PUSH_NOTIFICATIONS
// key.subscribe
router->add_handler(restinio::http_method_subscribe(),
"/key/:hash", std::bind(&DhtProxyServer::subscribe, this, _1, _2));
// key.unsubscribe
router->add_handler(restinio::http_method_unsubscribe(),
"/key/:hash", std::bind(&DhtProxyServer::unsubscribe, this, _1, _2));
#endif //OPENDHT_PUSH_NOTIFICATIONS
#ifdef OPENDHT_PROXY_SERVER_IDENTITY
// key.sign
router->http_post("/key/:hash/sign", std::bind(&DhtProxyServer::putSigned, this, _1, _2));
// key.encrypt
router->http_post("/key/:hash/encrypt", std::bind(&DhtProxyServer::putEncrypted, this, _1, _2));
#endif // OPENDHT_PROXY_SERVER_IDENTITY
return router;
}
RequestStatus
DhtProxyServer::getNodeInfo(restinio::request_handle_t request,
restinio::router::route_params_t /*params*/) const
{
try {
if (auto nodeInfo = nodeInfo_) {
auto result = nodeInfo->toJson();
// [ipv6:ipv4]:port or ipv4:port
result["public_ip"] = request->remote_endpoint().address().to_string();
auto response = initHttpResponse(request->create_response());
response.append_body(Json::writeString(jsonBuilder_, result) + "\n");
return response.done();
}
auto response = initHttpResponse(request->create_response(restinio::status_service_unavailable()));
response.set_body(RESP_MSG_SERVICE_UNAVAILABLE);
return response.done();
} catch (...) {
return serverError(*request);
}
}
RequestStatus
DhtProxyServer::getStats(restinio::request_handle_t request,
restinio::router::route_params_t /*params*/)
{
requestNum_++;
try {
if (auto stats = stats_) {
auto response = initHttpResponse(request->create_response());
response.append_body(Json::writeString(jsonBuilder_, stats->toJson()) + "\n");
return response.done();
} else {
auto response = initHttpResponse(request->create_response(restinio::status_service_unavailable()));
response.set_body(RESP_MSG_SERVICE_UNAVAILABLE);
return response.done();
}
} catch (...){
return serverError(*request);
}
}
RequestStatus
DhtProxyServer::get(restinio::request_handle_t request,
restinio::router::route_params_t params)
{
requestNum_++;
try {
InfoHash infoHash(params["hash"].to_string());
if (!infoHash)
infoHash = InfoHash::get(params["hash"].to_string());
auto response = std::make_shared<ResponseByPartsBuilder>(
initHttpResponse(request->create_response<ResponseByParts>()));
response->flush();
dht_->get(infoHash, [this, response](const std::vector<Sp<Value>>& values) {
for (const auto& value : values) {
auto output = Json::writeString(jsonBuilder_, value->toJson()) + "\n";
response->append_chunk(output);
}
response->flush();
return true;
},
[response] (bool /*ok*/){
response->done();
});
return restinio::request_handling_status_t::accepted;
} catch (const std::exception& e){
return serverError(*request);
}
}
RequestStatus
DhtProxyServer::listen(restinio::request_handle_t request,
restinio::router::route_params_t params)
{
requestNum_++;
try {
InfoHash infoHash(params["hash"].to_string());
if (!infoHash)
infoHash = InfoHash::get(params["hash"].to_string());
auto response = std::make_shared<ResponseByPartsBuilder>(
initHttpResponse(request->create_response<ResponseByParts>()));
response->flush();
std::lock_guard<std::mutex> lock(lockListener_);
// save the listener to handle a disconnect
auto &session = listeners_[request->connection_id()];
session.hash = infoHash;
session.response = response;
session.token = dht_->listen(infoHash, [this, response]
(const std::vector<Sp<Value>>& values, bool expired){
for (const auto& value: values){
auto jsonVal = value->toJson();
if (expired)
jsonVal["expired"] = true;
response->append_chunk(Json::writeString(jsonBuilder_, jsonVal) + "\n");
}
response->flush();
return true;
});
return restinio::request_handling_status_t::accepted;
} catch (const std::exception& e){
return serverError(*request);
}
}
#ifdef OPENDHT_PUSH_NOTIFICATIONS
RequestStatus
DhtProxyServer::subscribe(restinio::request_handle_t request,
restinio::router::route_params_t params)
{
requestNum_++;
InfoHash infoHash(params["hash"].to_string());
if (!infoHash)
infoHash = InfoHash::get(params["hash"].to_string());
try {
std::string err;
Json::Value r;
auto* char_data = reinterpret_cast<const char*>(request->body().data());
auto reader = std::unique_ptr<Json::CharReader>(jsonReaderBuilder_.newCharReader());
if (!reader->parse(char_data, char_data + request->body().size(), &r, &err)){
auto response = initHttpResponse(request->create_response(restinio::status_bad_request()));
response.set_body(RESP_MSG_JSON_INCORRECT);
return response.done();
}
const Json::Value& root(r); // parse using const Json so [] never creates element
auto pushToken = root["key"].asString();
if (pushToken.empty()){
auto response = initHttpResponse(request->create_response(restinio::status_bad_request()));
response.set_body(RESP_MSG_NO_TOKEN);
return response.done();
}
auto isAndroid = root["platform"].asString() == "android";
auto clientId = root["client_id"].asString();
auto sessionId = root["session_id"].asString();
if (logger_)
logger_->d("[proxy:server] [subscribe %s] [client %s] [session %s]", infoHash.toString().c_str(), clientId.c_str(), sessionId.c_str());
// ================ Search for existing listener ===================
// start the timer
auto timeout = std::chrono::steady_clock::now() + proxy::OP_TIMEOUT;
std::lock_guard<std::mutex> lock(lockPushListeners_);
// Insert new or return existing push listeners of a token
auto& pushListener = pushListeners_[pushToken];
auto& pushListeners = pushListener.listeners[infoHash];
for (auto &listener: pushListeners) {
// Found -> Resubscribe
if (listener.clientId == clientId) {
if (logger_)
logger_->d("[proxy:server] [subscribe] found [client %s]", listener.clientId.c_str());
// Reset timers
listener.expireTimer->expires_at(timeout);
listener.expireNotifyTimer->expires_at(timeout - proxy::OP_MARGIN);
{
std::lock_guard<std::mutex> l(listener.sessionCtx->lock);
listener.sessionCtx->sessionId = sessionId;
}
// Send response header
auto response = std::make_shared<ResponseByPartsBuilder>(
initHttpResponse(request->create_response<ResponseByParts>()));
response->flush();
if (!root["refresh"].asBool()) {
// No Refresh
dht_->get(infoHash, [this, response](const Sp<Value>& value){
auto output = Json::writeString(jsonBuilder_, value->toJson()) + "\n";
response->append_chunk(output);
response->flush();
return true;
},
[response] (bool){
response->done();
});
} else {
// Refresh
response->append_chunk("{}\n");
response->done();
}
return restinio::request_handling_status_t::accepted;
}
}
// =========== No existing listener for an infoHash ============
// Add new listener to list of listeners
pushListeners.emplace_back(Listener{});
auto &listener = pushListeners.back();
listener.clientId = clientId;
listener.sessionCtx = std::make_shared<PushSessionContext>();
listener.sessionCtx->sessionId = sessionId;
// Add listen on dht
listener.internalToken = dht_->listen(infoHash,
[this, infoHash, pushToken, isAndroid, clientId, sessionCtx = listener.sessionCtx]
(const std::vector<std::shared_ptr<Value>>& values, bool expired){
// Build message content
Json::Value json;
json["key"] = infoHash.toString();
json["to"] = clientId;
json["t"] = Json::Value::Int64(std::chrono::duration_cast<std::chrono::milliseconds>(system_clock::now().time_since_epoch()).count());
{
std::lock_guard<std::mutex> l(sessionCtx->lock);
json["s"] = sessionCtx->sessionId;
}
if (expired and values.size() < 2){
std::stringstream ss;
for(size_t i = 0; i < values.size(); ++i){
if(i != 0) ss << ",";
ss << values[i]->id;
}
json["exp"] = ss.str();
}
auto maxPrio = 1000u;
for (const auto& v : values)
maxPrio = std::min(maxPrio, v->priority);
sendPushNotification(pushToken, std::move(json), isAndroid, !expired and maxPrio == 0);
return true;
}
);
// expire notify
if (!listener.expireNotifyTimer)
listener.expireNotifyTimer = std::make_unique<asio::steady_timer>(io_context(), timeout - proxy::OP_MARGIN);
else
listener.expireNotifyTimer->expires_at(timeout - proxy::OP_MARGIN);
auto jsonProvider = [infoHash, clientId, sessionCtx = listener.sessionCtx](){
Json::Value json;
json["timeout"] = infoHash.toString();
json["to"] = clientId;
std::lock_guard<std::mutex> l(sessionCtx->lock);
json["s"] = sessionCtx->sessionId;
return json;
};
listener.expireNotifyTimer->async_wait(std::bind(&DhtProxyServer::handleNotifyPushListenExpire, this,
std::placeholders::_1, pushToken, std::move(jsonProvider), isAndroid));
// cancel push listen
if (!listener.expireTimer)
listener.expireTimer = std::make_unique<asio::steady_timer>(io_context(), timeout);
else
listener.expireTimer->expires_at(timeout);
listener.expireTimer->async_wait(std::bind(&DhtProxyServer::handleCancelPushListen, this,
std::placeholders::_1, pushToken, infoHash, clientId));
auto response = initHttpResponse(request->create_response());
response.set_body("{}\n");
return response.done();
}
catch (...) {
return serverError(*request);
}
return restinio::request_handling_status_t::accepted;
}
RequestStatus
DhtProxyServer::unsubscribe(restinio::request_handle_t request,
restinio::router::route_params_t params)
{
requestNum_++;
InfoHash infoHash(params["hash"].to_string());
if (!infoHash)
infoHash = InfoHash::get(params["hash"].to_string());
if (logger_)
logger_->d("[proxy:server] [unsubscribe %s]", infoHash.toString().c_str());
try {
std::string err;
Json::Value root;
auto* char_data = reinterpret_cast<const char*>(request->body().data());
auto reader = std::unique_ptr<Json::CharReader>(jsonReaderBuilder_.newCharReader());
if (!reader->parse(char_data, char_data + request->body().size(), &root, &err)){
auto response = initHttpResponse(
request->create_response(restinio::status_bad_request()));
response.set_body(RESP_MSG_JSON_INCORRECT);
return response.done();
}
auto pushToken = root["key"].asString();
if (pushToken.empty())
return restinio::request_handling_status_t::rejected;
auto clientId = root["client_id"].asString();
handleCancelPushListen(asio::error_code() /*success*/, pushToken, infoHash, clientId);
auto response = initHttpResponse(request->create_response());
return response.done();
}
catch (...) {
return serverError(*request);
}
}
void
DhtProxyServer::handleNotifyPushListenExpire(const asio::error_code &ec, const std::string pushToken,
std::function<Json::Value()> jsonProvider, const bool isAndroid)
{
if (ec == asio::error::operation_aborted)
return;
else if (ec) {
if (logger_)
logger_->e("[proxy:server] [subscribe] error sending put refresh: %s", ec.message().c_str());
}
if (logger_)
logger_->d("[proxy:server] [subscribe] sending put refresh to %s token", pushToken.c_str());
sendPushNotification(pushToken, jsonProvider(), isAndroid, false);
}
void
DhtProxyServer::handleCancelPushListen(const asio::error_code &ec, const std::string pushToken,
const InfoHash key, const std::string clientId)
{
if (ec == asio::error::operation_aborted)
return;
else if (ec){
if (logger_)
logger_->e("[proxy:server] [listen:push %s] error cancel: %s",
key.toString().c_str(), ec.message().c_str());
}
if (logger_)
logger_->d("[proxy:server] [listen:push %s] cancelled for %s",
key.toString().c_str(), clientId.c_str());
std::lock_guard<std::mutex> lock(lockListener_);
auto pushListener = pushListeners_.find(pushToken);
if (pushListener == pushListeners_.end())
return;
auto listeners = pushListener->second.listeners.find(key);
if (listeners == pushListener->second.listeners.end())
return;
for (auto listener = listeners->second.begin(); listener != listeners->second.end();){
if (listener->clientId == clientId){
if (dht_)
dht_->cancelListen(key, std::move(listener->internalToken));
listener = listeners->second.erase(listener);
} else {
++listener;
}
}
if (listeners->second.empty())
pushListener->second.listeners.erase(listeners);
if (pushListener->second.listeners.empty())
pushListeners_.erase(pushListener);
}
void
DhtProxyServer::sendPushNotification(const std::string& token, Json::Value&& json, bool isAndroid, bool highPriority)
{
if (pushServer_.empty())
return;
unsigned reqid = 0;
try {
auto request = std::make_shared<http::Request>(io_context(), pushHostPort_.first, pushHostPort_.second,
httpsServer_ ? true : false, logger_);
reqid = request->id();
request->set_target("/api/push");
request->set_method(restinio::http_method_post());
request->set_header_field(restinio::http_field_t::host, pushServer_.c_str());
request->set_header_field(restinio::http_field_t::user_agent, "RESTinio client");
request->set_header_field(restinio::http_field_t::accept, "*/*");
request->set_header_field(restinio::http_field_t::content_type, "application/json");
// NOTE: see https://github.com/appleboy/gorush
Json::Value notification(Json::objectValue);
Json::Value tokens(Json::arrayValue);
tokens[0] = token;
notification["tokens"] = std::move(tokens);
notification["platform"] = isAndroid ? 2 : 1;
notification["data"] = std::move(json);
notification["priority"] = highPriority ? "high" : "normal";
notification["time_to_live"] = 600;
Json::Value notifications(Json::arrayValue);
notifications[0] = notification;
Json::Value content;
content["notifications"] = std::move(notifications);
request->set_body(Json::writeString(jsonBuilder_, content));
request->add_on_state_change_callback([this, reqid]
(http::Request::State state, const http::Response& response){
if (state == http::Request::State::DONE){
if (logger_ and response.status_code != 200)
logger_->e("[proxy:server] [notification] push failed: %i", response.status_code);
std::lock_guard<std::mutex> l(requestLock_);
requests_.erase(reqid);
}
});
{
std::lock_guard<std::mutex> l(requestLock_);
requests_[reqid] = request;
}
request->send();
}
catch (const std::exception &e){
if (logger_)
logger_->e("[proxy:server] [notification] error send push: %i", e.what());
if (reqid) {
std::lock_guard<std::mutex> l(requestLock_);
requests_.erase(reqid);
}
}
}
#endif //OPENDHT_PUSH_NOTIFICATIONS
void
DhtProxyServer::handleCancelPermamentPut(const asio::error_code &ec, const InfoHash& key, Value::Id vid)
{
if (ec == asio::error::operation_aborted)
return;
else if (ec){
if (logger_)
logger_->e("[proxy:server] [put:permament] error sending put refresh: %s", ec.message().c_str());
}
if (logger_)
logger_->d("[proxy:server] [put %s] cancel permament put %i", key.toString().c_str(), vid);
auto sPuts = puts_.find(key);
if (sPuts == puts_.end())
return;
auto& sPutsMap = sPuts->second.puts;
auto put = sPutsMap.find(vid);
if (put == sPutsMap.end())
return;
if (dht_)
dht_->cancelPut(key, vid);
if (put->second.expireNotifyTimer)
put->second.expireNotifyTimer->cancel();
sPutsMap.erase(put);
if (sPutsMap.empty())
puts_.erase(sPuts);
}
RequestStatus
DhtProxyServer::put(restinio::request_handle_t request,
restinio::router::route_params_t params)
{
requestNum_++;
InfoHash infoHash(params["hash"].to_string());
if (!infoHash)
infoHash = InfoHash::get(params["hash"].to_string());
if (request->body().empty()){
auto response = initHttpResponse(request->create_response(restinio::status_bad_request()));
response.set_body(RESP_MSG_MISSING_PARAMS);
return response.done();
}
try {
std::string err;
Json::Value root;
auto* char_data = reinterpret_cast<const char*>(request->body().data());
auto reader = std::unique_ptr<Json::CharReader>(jsonReaderBuilder_.newCharReader());
if (reader->parse(char_data, char_data + request->body().size(), &root, &err)){
auto value = std::make_shared<Value>(root);
bool permanent = root.isMember("permanent");
if (logger_)
logger_->d("[proxy:server] [put %s] %s %s", infoHash.toString().c_str(),
value->toString().c_str(), (permanent ? "permanent" : ""));
if (permanent) {
std::string pushToken, clientId, sessionId, platform;
auto& pVal = root["permanent"];
if (pVal.isObject()){
pushToken = pVal["key"].asString();
clientId = pVal["client_id"].asString();
platform = pVal["platform"].asString();
sessionId = pVal["session_id"].asString();
}
std::unique_lock<std::mutex> lock(lockSearchPuts_);
auto timeout = std::chrono::steady_clock::now() + proxy::OP_TIMEOUT;
auto vid = value->id;
auto& sPuts = puts_[infoHash];
auto& pput = sPuts.puts[vid];
if (not pput.expireTimer) {
auto &ctx = io_context();
// cancel permanent put
pput.expireTimer = std::make_unique<asio::steady_timer>(ctx, timeout);
pput.expireTimer->async_wait(std::bind(&DhtProxyServer::handleCancelPermamentPut, this,
std::placeholders::_1, infoHash, vid));
#ifdef OPENDHT_PUSH_NOTIFICATIONS
if (not pushToken.empty()){
pput.sessionCtx = std::make_shared<PushSessionContext>();
pput.sessionCtx->sessionId = sessionId;
// notify push listen expire
bool isAndroid = platform == "android";
auto jsonProvider = [infoHash, clientId, vid, sessionCtx = pput.sessionCtx](){
Json::Value json;
json["timeout"] = infoHash.toString();
json["to"] = clientId;
json["vid"] = std::to_string(vid);
std::lock_guard<std::mutex> l(sessionCtx->lock);
json["s"] = sessionCtx->sessionId;
return json;
};
if (!pput.expireNotifyTimer)
pput.expireNotifyTimer = std::make_unique<asio::steady_timer>(ctx,
timeout - proxy::OP_MARGIN);
else
pput.expireNotifyTimer->expires_at(timeout - proxy::OP_MARGIN);
pput.expireNotifyTimer->async_wait(std::bind(
&DhtProxyServer::handleNotifyPushListenExpire, this,
std::placeholders::_1, pushToken, std::move(jsonProvider), isAndroid));
}
#endif
} else {
if (not sessionId.empty()) {
if (not pput.sessionCtx)
pput.sessionCtx = std::make_shared<PushSessionContext>();
std::lock_guard<std::mutex> l(pput.sessionCtx->lock);
pput.sessionCtx->sessionId = sessionId;
}
pput.expireTimer->expires_at(timeout);
if (pput.expireNotifyTimer)
pput.expireNotifyTimer->expires_at(timeout - proxy::OP_MARGIN);
}
}
dht_->put(infoHash, value, [this, request, value](bool ok){
if (ok){
auto output = Json::writeString(jsonBuilder_, value->toJson()) + "\n";
auto response = initHttpResponse(request->create_response());
response.append_body(output);
response.done();
} else {
auto response = initHttpResponse(request->create_response(restinio::status_bad_gateway()));
response.set_body(RESP_MSG_PUT_FAILED);
response.done();
}
}, time_point::max(), permanent);
return restinio::request_handling_status_t::accepted;
} else {
auto response = initHttpResponse(request->create_response(restinio::status_bad_request()));
response.set_body(RESP_MSG_JSON_INCORRECT);
return response.done();
}
} catch (const std::exception& e){
if (logger_)
logger_->d("[proxy:server] error in put: %s", e.what());
return serverError(*request);
}
}
#ifdef OPENDHT_PROXY_SERVER_IDENTITY
RequestStatus
DhtProxyServer::putSigned(restinio::request_handle_t request,
restinio::router::route_params_t params) const
{
requestNum_++;
InfoHash infoHash(params["hash"].to_string());
if (!infoHash)
infoHash = InfoHash::get(params["hash"].to_string());
if (request->body().empty()){
auto response = initHttpResponse(request->create_response(restinio::status_bad_request()));
response.set_body(RESP_MSG_MISSING_PARAMS);
return response.done();
}
try {
std::string err;
Json::Value root;
auto* char_data = reinterpret_cast<const char*>(request->body().data());
auto reader = std::unique_ptr<Json::CharReader>(jsonReaderBuilder_.newCharReader());
if (reader->parse(char_data, char_data + request->body().size(), &root, &err)){
auto value = std::make_shared<Value>(root);
dht_->putSigned(infoHash, value, [this, request, value](bool ok){
if (ok){
auto output = Json::writeString(jsonBuilder_, value->toJson()) + "\n";
auto response = initHttpResponse(request->create_response());
response.append_body(output);
response.done();
} else {
auto response = initHttpResponse(request->create_response(restinio::status_bad_gateway()));
response.set_body(RESP_MSG_PUT_FAILED);
response.done();
}
});
return restinio::request_handling_status_t::accepted;
} else {
auto response = initHttpResponse(request->create_response(restinio::status_bad_request()));
response.set_body(RESP_MSG_JSON_INCORRECT);
return response.done();
}
} catch (const std::exception& e){
if (logger_)
logger_->d("[proxy:server] error in putSigned: %s", e.what());
return serverError(*request);
}
}
RequestStatus
DhtProxyServer::putEncrypted(restinio::request_handle_t request,
restinio::router::route_params_t params)
{
requestNum_++;
InfoHash infoHash(params["hash"].to_string());
if (!infoHash)
infoHash = InfoHash::get(params["hash"].to_string());
if (request->body().empty()){
auto response = initHttpResponse(request->create_response(restinio::status_bad_request()));
response.set_body(RESP_MSG_MISSING_PARAMS);
return response.done();
}
try {
std::string err;
Json::Value root;
auto* char_data = reinterpret_cast<const char*>(request->body().data());
auto reader = std::unique_ptr<Json::CharReader>(jsonReaderBuilder_.newCharReader());
if (reader->parse(char_data, char_data + request->body().size(), &root, &err)){
InfoHash to(root["to"].asString());
if (!to){
auto response = initHttpResponse(request->create_response(restinio::status_bad_request()));
response.set_body(RESP_MSG_DESTINATION_NOT_FOUND);
return response.done();
}
auto value = std::make_shared<Value>(root);
dht_->putEncrypted(infoHash, to, value, [this, request, value](bool ok){
if (ok){
auto response = initHttpResponse(request->create_response());
response.append_body(Json::writeString(jsonBuilder_, value->toJson()) + "\n");
response.done();
} else {
auto response = initHttpResponse(request->create_response(restinio::status_bad_gateway()));
response.set_body(RESP_MSG_PUT_FAILED);
response.done();
}
});
return restinio::request_handling_status_t::accepted;
} else {
auto response = initHttpResponse(request->create_response(restinio::status_bad_request()));
response.set_body(RESP_MSG_JSON_INCORRECT);
return response.done();
}
} catch (const std::exception& e){
if (logger_)
logger_->d("[proxy:server] error in put: %s", e.what());
return serverError(*request);
}
}
#endif // OPENDHT_PROXY_SERVER_IDENTITY
RequestStatus
DhtProxyServer::options(restinio::request_handle_t request,
restinio::router::route_params_t /*params*/)
{
requestNum_++;
#ifdef OPENDHT_PROXY_SERVER_IDENTITY
const auto methods = "OPTIONS, GET, POST, LISTEN, SIGN, ENCRYPT";
#else
const auto methods = "OPTIONS, GET, POST, LISTEN";
#endif
auto response = initHttpResponse(request->create_response());
response.append_header(restinio::http_field::access_control_allow_methods, methods);
response.append_header(restinio::http_field::access_control_allow_headers, "content-type");
response.append_header(restinio::http_field::access_control_max_age, "86400");
return response.done();
}
RequestStatus
DhtProxyServer::getFiltered(restinio::request_handle_t request,
restinio::router::route_params_t params)
{
requestNum_++;
auto value = params["value"].to_string();
InfoHash infoHash(params["hash"].to_string());
if (!infoHash)
infoHash = InfoHash::get(params["hash"].to_string());
try {
auto response = std::make_shared<ResponseByPartsBuilder>(
initHttpResponse(request->create_response<ResponseByParts>()));
response->flush();
dht_->get(infoHash,
[this, response](const Sp<Value>& value) {
response->append_chunk(Json::writeString(jsonBuilder_, value->toJson()) + "\n");
response->flush();
return true;
},
[response] (bool /*ok*/){
response->done();
},
{}, value);
return restinio::request_handling_status_t::accepted;
} catch (const std::exception& e){
return serverError(*request);
}
}
}
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